Micro-templating for iOS

gistfile1.m

// https://github.com/jasonmoo/t.js, http://news.ycombinator.com/item?id=4378578

static inline NSString *F(NSString *string, id object) {    
    NSMutableString *result = [[string mutableCopy] autorelease];

    void (^replace)(NSMutableString *, NSString *, id) =
            ^ (NSMutableString *string, NSString *key, id value) {
        NSString *stringValue = [value isKindOfClass:[NSNumber class]] 
                ? [NSString stringWithFormat:@"%@", (NSNumber *)value] : value;
                
        [string replaceOccurrencesOfString:key withString:stringValue options:NSCaseInsensitiveSearch
                                     range:NSMakeRange(0, [string length])];
    };
    
    if ([object isKindOfClass:[NSArray class]]) {
        NSArray *array = (NSArray *)object;
            
        for (int key = 0; key < array.count; key++)
            replace(result, [NSString stringWithFormat:@"{%d}", key], [array objectAtIndex:key]);
        
    } else if ([object isKindOfClass:[NSDictionary class]]) {
        NSDictionary *dictionary = (NSDictionary *)object;
        
        for (NSString *key in [dictionary allKeys])
            replace(result, [NSString stringWithFormat:@"{%@}", key], [dictionary objectForKey:key]);
    }
        
    return result;
}

F(@"My name is {0} {1}", @[@"Bryan", @"Irace"]);
F(@"I am {age} years old", @{ @"age" : @26 });